LUM5001: Request API used during prerender

Severity: error · Category: routing and server (5xxx)

Reported by: lumiose build, while it prerenders static routes and spa pages with prerender.

#What it means

static routes (the default) and spa pages with prerender are rendered at build time, where there is no request: no cookies, headers, query string or locals. Using request(), cookies(), locals(), response() or url().searchParams there (or ctx.request, ctx.cookies and ctx.locals in a static endpoint or headers(ctx)) cannot work, and the build stops. Middleware still runs for prerendered routes and may read the (empty) request; only route code is checked.

#Example

export default function Home() {
  const theme = cookies().get("theme");
  return <h1 class={theme}>Home</h1>;
}

#How to fix it

Render the route per request: export const mode = "server"; (for an spa page, remove prerender or set export const prerender = false). Or keep the route prerendered and move the request-dependent part into an island (in an spa page, onMount() or an event handler) that reads it in the browser or calls an endpoint.

#Related

• Rendering modes
• Server